“I know it’s raining” contains the autoclitic tact “I know,” controlled by the strength of the controlling relationship between the controlling variable for “it’s raining” and the response itself.
A verbal relationship with the following features:
A non-verbal stimulus
The non-verbal stimulus is some aspect of a primary verbal relationship
The specific features of the controlling relationship (e.g., receptor being stimulated or the intensity or strength of the stimulation; stimulation may include an establishing response)
The form of the response